[BUG] pylint w0614 combine exception

[stdweird]

Describe the bug
Pylint now has new ways of merging wildcard import errors since pylint-dev/pylint#5110 was merged. Now the regex in https://github.com/PyCQA/prospector/blob/master/prospector/tools/pylint/__init__.py#L235 has no match, and raises an exception

    prospector.execute()
  File "/some/path/workspace/.eggs/prospector-1.5.3.1-py3.6.egg/prospector/run.py", line 69, in execute
    messages += tool.run(found_files)
  File "/some/path/workspace/.eggs/prospector-1.5.3.1-py3.6.egg/prospector/tools/pylint/__init__.py", line 262, in run
    return self.combine(messages)
  File "/some/path/workspace/.eggs/prospector-1.5.3.1-py3.6.egg/prospector/tools/pylint/__init__.py", line 254, in combine
    combined = self._combine_w0614(messages)
  File "/some/path/workspace/.eggs/prospector-1.5.3.1-py3.6.egg/prospector/tools/pylint/__init__.py", line 235, in _combine_w0614
    names.append(_UNUSED_WILDCARD_IMPORT_RE.match(msg.message).group(1))
AttributeError: 'NoneType' object has no attribute 'group'

To Reproduce
Steps to reproduce the behavior:

1. Go to '...'
2. Call prospector the following way '....'
3. See error

Expected behavior
non-matching group exception is handled.
ideally detecting this is an already merged message?

Environment (please complete the following information):

• OS: [e.g. macOS] linux
• Tool [e.g. pylint] pylint
• Prospector version [e.g. 1.1.7] 1.5.3.1
• Python version [e.g. 3.6.8] 3.6.9

Additional context

[thburghout]

Confirmed. The regex should be

_UNUSED_WILDCARD_IMPORT_RE = re.compile(r"^Unused import\(s\) (.*) from wildcard import")

[Pierre-Sassoulas]

@thburghout I would merge a fix for this if you want to open a merge request :)

[carlio]

I've added this fix onto the master branch, thanks for the investigation and regex :-) I'll go out with the 1.7.1 release